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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a75cd0328d038f17c68b6fc858daec4d79e167a558c9a93eb527aaa806199b' 
  AND token = 'gNvigUwJHKxO1GAiY4wOG02T6pHE+Y3klCeA1+78JX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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