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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68105bffe8313c090fef2242e4fe31f5fff4e17be873efc4ba13949e07bdb75e' 
  AND token = 'P62uD3RtM7gkaiFlARo+dqEpTMRlf+Gc/Np0Hqhq89U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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