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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c390937e681a6acbea2852ede91c1752c3432b2f97a223edcefeaa4d0835a2f2' 
  AND token = '0YH2SaDP40FwSS4WtVZD2waUAQS33jZtow+BnssRd58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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