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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e472798f06a6283eb3242ae8b250fdedde27245ea2d054fe06a5414627418a61' 
  AND token = 'QYa+CYU7/cny8Z1Vz2Zvuhv+fpPt2SN4q5X/4gMzP6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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