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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada48136666234974baedae6fdb717b0a9b55752849ba84d666bbe0f4e11dfe2' 
  AND token = 'AxspDpkJb1mMdsG9yRJzKcfcxM6yV41ppDqXGlKMB8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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