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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05090108103a1d2836b642d6e8dec21360d94d3a4164fd4ced0388389fdf2832' 
  AND token = 'VHffn9E46Ay3nMVG2c7oBQp11mEJm+8Q3oJlKYr/J+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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