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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5a0bf7332f07a7f326774fe49b3f1d2178fb6c374317688aa24bfa623e2771' 
  AND token = '7oBnk23wIZoTmINHQcZ5gx0fmJTkDDCxjO7LDTrxtMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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