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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe05170df4920dd0d386f49cedcf010c5ef61bffd3f31a90e3cd09d000b8fd7' 
  AND token = '9BxvWwV0z1v+SPnfUD4fQkJggB9LhGAM27pDpFiO4vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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