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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5d5a379f2cbd8ac80ee553773f7e3934fad566e2ab315b185eecbfb5410dfe' 
  AND token = 'm0Y67Zdk0I58772D2kBFkIfda0uK8187c7GELuBh9kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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