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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0eb4b8810be601121c7c977cf66b09b6e59811b856f8197ae8e22f7f4ee461' 
  AND token = 'v/7hZgQAihZDNC3crtLZoCFplw69ENZpXH/hCaLnghA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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