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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823e9783554753c1167d85e7168a54719a0be979da029d1e86d059a1802e5324' 
  AND token = 'Q7SVDz1JOAzLxwikQm1zLAFb8CFKG1guKbWpjja7Q34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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