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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc99e82fe352fb5c8964630df7ba82301f14f0aa908e40982ffb2b8e2b02008' 
  AND token = '1EapJw2aIlnCm2Ra2Ai7nq3z1jNeqFvOG8ZZlkCPqus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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