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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb65459434be02ef2f0a930940fbb666bb54b4890f57ce7c8104ccd8b63d26c2' 
  AND token = 'dbq5e1FZFija1fwD1SHCCIlpjTbvYWzN4td8tcmKQ30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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