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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217abfba72fbb7f971b5a3926cdb2fa4dec7a5ce67baaf1ed56ce030e47c58d5' 
  AND token = '8MG+Uj1VBlVGQ9DtDv9uzmlu3qZF0vGaQyRyDnmGnwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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