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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0c4389c532a084167ae78050e77010ccd3dfbe111247f3cf4050679677518b' 
  AND token = 'b6hzGmZj9rgbrYcH99YhmJeFHVh9epP7I27ad/m+hW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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