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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ef8a978212a305757cc7b6177f763ec3507955a4d80bcd58987a7909e13f5e' 
  AND token = 'G/Y0QYgkDFQmwmOHuHZobjFmg5vF7smwknFAC8ULhso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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