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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d82b1d696480672adc5ad63da7d2eec4ea87b622796512d06a3ad9b7cd39e1' 
  AND token = 'f43xIftSgWWqa6YplupdeqsWOLg+I0G69s5zco4k6OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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