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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08490108a5873ed2b7b5b1e70924c5158e8ba90be0cc487b013b0a611ded44f9' 
  AND token = '1/50kOUUck5hCQUlLrJ5sWsgMPmEpcfeWF7dsdBzdwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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