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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58381869aebdfe9d51e6510b40c4dc1f5cabc5d48dbb46eaf6e4fe2a754d6efb' 
  AND token = 'ceCj9Qd7FGD8TL6L5jkmABZ2E8AO2c5nnVzA+Y+RhKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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