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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34391d4e4fead6a857c7149cebcc648398a0e6b8417eaf55ebda18e973334f14' 
  AND token = 'Ce20vCsvhmU26yAXHX3/rzrDE2Cl6OXEmFie3jwTTx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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