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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0eab77367958f8c1a0ccd538c12476728ba4a4d6e0bc93f491dfa518c150ca1' 
  AND token = 'P6UvljBaRzhQMzerC6vaKSvYU7I4n0CwuKPDPKR/Suc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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