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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42a9ad5ad7f7b12e2259e5c7611367b1e5b981158e22db8127acee9cbbfc216' 
  AND token = 'TevIlrt+Dis8QvkABkl8iKnI+UTOgQE0nFJJytCIYOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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