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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9890a436e6cb65aa586a3c9debfb084113e1df541a67d7178309d3c3889d14ed' 
  AND token = 'ydaRjFCRVvthNmxywcB4LdlO4vljCJUCMqwJ7X2a0/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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