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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b9a86e722101be60bf0a148c741208cfc3f3fb5de527987f676d7beb9676ce' 
  AND token = 'ibPL9yeRWGog42/K5d6yqa9znqZ14r21pdezFAXfvlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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