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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab8a52db4dd4ebafedb9549677872c84bf2abbfbed12106b031484f0e18acd6' 
  AND token = 'vkEm+JR1N9BQnbcLWO90GfQIQXZCv+jqYHu7oodb/u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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