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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dce3c9603b86b77dac6626c65fb640c7197eeae371f4bd00078f958e0729d5' 
  AND token = 'Mc8nXhSAoQExfyrJPir5kXmWazP9BN2Lk5UgCJ+wcpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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