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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6934995a0faaa3bee26649b10ff7535409242d79cbf42e2cc0a482d8e9644d4b' 
  AND token = 'LHPbW3UG9J7AALOz3MlH9oK88yBr935iNaJKDDDD3Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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