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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d91d304467d6eaa0e4ebd9569ce0b6908761af30995a5a737fb94173c97343d' 
  AND token = 'GL7FrDdYFpZbEn1sBjI366UZ/+gd39bavV2TNa0XqP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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