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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e424e3e829bf275622a20c0be6c23f95135040f559174d096ab1e2cfdf679eb' 
  AND token = '+32QDhczKIMR2DdGQ7zMa3xFcPSk6yWWkry4oAH7hI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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