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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e49225f9183a5e4a2d226e35839d3e0a62784f67a4ebcc411efc22f699c049' 
  AND token = 'J20RQSI+n+KMO4SGhN9aca9Hj7nl0r2a/KugPf7VjE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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