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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1c93f60d3aa71e928bd119afccb23a05369b358ff8ebc4e5ed393e5aef18ba' 
  AND token = 'm65hrAGhKyW2lWL+hPR667awSwoXHEOR5un1gBZ7R8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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