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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc6485e24b26d6b5e0c81c8a63dda6ff75a6d234ddace773b8ae05e6a6e9f6e' 
  AND token = 'uS3vEAeato0fdPEsohUO21dhU0RJWN0xD917NTGMtsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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