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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb0e23f05f9b72ef342c5910961d5888548e0947d949fb0b7f8f6ea47632562' 
  AND token = 'Mz30fFGUGKW4gYZ2sNDjjTPrP03EGdRHgs4SvRF5m+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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