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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f145341fa57505822e02aa88c2196265ca3ad85a3c2030b07a2c20f9629a225e' 
  AND token = 'vQ7ZT2yzsTGBgTCjjVZI+aqxsBlmBJXDNbVM3t86p6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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