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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7156b02010a0e006897fb525f927c58bbea0aff087b36fb9e14c5e487e6813e0' 
  AND token = 'TPTLhO2lEe2snPgbexiOA4TvDaeTvBxoNpmjOoiInrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}