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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fde907ded4b22dc9b3a8a966622d5965a23bdd0f5223b51623bdb562af2606' 
  AND token = 'ZUhGmViH7KDfatiXuG1irJoMM6AwlXZlVoQLjgcuVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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