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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c872ba8781d74923ff1d862210341cb39fad10357c3cc1e5adddd45b1ef5bf5' 
  AND token = 'tp+5BINpriuht2tjDTqsYAj+8paP0+8ftHwxJ2WxiO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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