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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84964bb6425003092edb936b06e880ee43629e6c1193122098fb063193ae988' 
  AND token = 'Gq0zL8JOO/GMdGvjL43Fl+iLawVeYqByT6IKGy2edb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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