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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c428dc7cf1f82a395020ad13cd791b507e3a5d309fdde5177e4b61ee5ece73' 
  AND token = 'mnwUl11yNaCa/7Zqd1lbm+SIrvzyx+pVwAnOAZyAVeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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