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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b907da918dbe0ca16a44f403836c2e05dfacbe062be4db6e11a61780bc4fa041' 
  AND token = 'DtT/6LjqJf5oSf02rZvQw3wNrQM974DWnNF5LXf7ukA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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