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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb69c867ff9455b1a9ca76b774bdd95c77cacd881bc97b293408403aea18f204' 
  AND token = 'OM/2YC4i5iNBh48GsS66BvoGUbcDbEJugn9Ijbs7utE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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