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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766676fa4b67c39a7405fb91a53cb57362b9804af5b65ae0140d9322feb363b3' 
  AND token = '/4Dop5u9U4GI7I0Fr1LlvSPc+mti96jGaSc4iH4c8LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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