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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4976c856afa1bad98a6e26587e2775cafd33037ed4bcffee8d362b09b95fc2' 
  AND token = 'lxfs1OgyNCtcf1/axpa20a8IlkrHyjtPBCHu2+daKXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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