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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9488a4b766896b9644d4ad4fd5dd78620eef652b11b0bd9574b4c67560a2afd6' 
  AND token = 'VbkIQBe6RxfCmQJ2WyJRHvMpuvMNoywUT6lsTXUyY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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