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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f744377280e82f8779cc2510ee626376305c7442f555e9dd22d44cae39f7ad5' 
  AND token = 'LhPIVEquTrRgStAOW5LF2Xwks8QTmuMsq4Z/D6N9Unc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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