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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09404688cdfba059ec2892807712d892a3394af08749bff2ff679b658f761adb' 
  AND token = 'BnzB78dG7RbX2gRq1ymlCxU0ZOhWLczYKllc8iRKs2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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