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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ab0e9c62fb81dce13b5fd7bf6ec366262491109af18376164fe8162b3e75cf' 
  AND token = 'xCRfbtQI/sv7xSXi+Nl8vV5k2AA5acVnzcrtP5Zhn3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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