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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b691c4231f0b4693c1cbb19be659bd364ea7950d39e8ee4d423510e0de5d8924' 
  AND token = 'dJJ/Oy07B51ON4VQofpauHwAUSE8z6lG2p8qIuxqya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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