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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f757b6a8a4fc2674f4f34465ab264a93012dd41bc41468b27f52337b70815f4' 
  AND token = 'EvXz1od96vIllU62xdRM6E+XWsXa8DsI8jszmrYzs8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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