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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203d319e7202bde6b6ab36bb3373be0b58c8782c95393de918b2fd38cb56cf96' 
  AND token = 'sbLyQB6LN4vMNJtD5CIMKHhY3IE1PsSLHxAjasWYwxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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