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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520a79663faef7f47abe5df774dfea8f5dbf5ebf2081bcc1305ee76bd297df3d' 
  AND token = 'M0ipm96rRKBooS3WUSmPKdp5potiUsT1RgfKz/GnCao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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