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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904ed9be43efe1ef3bd8ec67171431fd1718c7bc132960d13d8b7521b0583253' 
  AND token = 'C/lZCFT5AET7kNP9YHD/d8LI2U2XqW/l6fgm+gBjL44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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