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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e2d9dcf86da135143a230d872609b96ac380931f5ee6dc57d3e902ef2cd39b' 
  AND token = 'J3HHxg3rtwnSOB27Ucwplf3Og7F6g+Vg+95I+/adwUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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