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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38f23c72544c2f08c09285152f12ef927a1a0d8e78198bc225d743418ea096d' 
  AND token = 'peGn639NFuL92e20ZpsOteR3O83Y1RW4VMqXUggJwRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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