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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2648dd65dfc70b358bb68cc369ccde0749b7a1acd5dd6a230312456063a17431' 
  AND token = '6uTvCwzrU2COeNGUUG+GuX/+big3iB9YXXNDQn3Ni/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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