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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b9108c8bafa2efccffeef288ca048f5d8ee52f3d218eaf0d0b49bbcd7507a1' 
  AND token = 'T0aV2jJUrmWOO7tOZaQT1iZJpJY4Ozc2tPKg1ClqMYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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