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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a152c7242b912a827422bde1ca26aeed1ec78da4fe8d43262f6824a6265561' 
  AND token = 'v5jb6cSEWLlcwBeLHnTHATWkOov2KatafnO/RKjM+yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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