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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65076ca8e0f561625a082cfc3e9479795c3ff141fb7243814d48c23cbdae046' 
  AND token = 'KrrvaloPDbAyaz8c14E7koXAnkI4AoyhC6YylQzCyfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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