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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e9b36997c9d453de06d6b1a009463134b80f1e790d82f8fdf5dc4062cc187e' 
  AND token = 'HBqvLE+St8An3epfc+3o9jAISVUDw17oxwdCXt+cu/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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